HexViewLine GetLine(HexColumnPosition position) => hexView.GetHexViewLineContainingBufferPosition(position.ActivePosition.BufferPosition);
void OnScroll(ScrollDirection value, double xCoordinate)
{
HexViewLine line;
HexBufferPoint lineStart;
switch (value)
{
case ScrollDirection.Left:
line = wpfHexView.Caret.ContainingHexViewLine;
if (line.TextLeft >= wpfHexView.ViewportLeft)
{
StopScrolling();
}
else if (wpfHexView.Caret.Position.Position.ActivePosition.BufferPosition != line.BufferStart)
{
editorOperations.MoveToPreviousCharacter(true);
}
else
{
wpfHexView.ViewportLeft = line.TextLeft;
StopScrolling();
}
break;
case ScrollDirection.Right:
line = wpfHexView.Caret.ContainingHexViewLine;
if (line.TextRight <= wpfHexView.ViewportRight)
{
StopScrolling();
}
else if (wpfHexView.Caret.Position.Position.ActivePosition.BufferPosition < line.BufferEnd)
{
editorOperations.MoveToNextCharacter(true);
}
else
{
wpfHexView.ViewportLeft = Math.Max(0, line.TextRight - wpfHexView.ViewportWidth);
StopScrolling();
}
break;
case ScrollDirection.Up:
line = wpfHexView.HexViewLines.FirstVisibleLine;
if (line.VisibilityState == VSTF.VisibilityState.FullyVisible && !line.IsFirstDocumentLine())
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(line.BufferStart - 1);
}
lineStart = line.BufferStart;
if (line.VisibilityState != VSTF.VisibilityState.FullyVisible)
{
wpfHexView.DisplayHexLineContainingBufferPosition(line.BufferStart, 0, VSTE.ViewRelativePosition.Top);
}
if (!line.IsValid)
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(lineStart);
}
if (line.IsFirstDocumentLine())
{
StopScrolling();
}
editorOperations.MoveCaret(line, xCoordinate, true, hexMoveToFlags);
break;
case ScrollDirection.Down:
line = wpfHexView.HexViewLines.LastVisibleLine;
if (line.VisibilityState == VSTF.VisibilityState.FullyVisible && !line.IsLastDocumentLine())
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(line.BufferEnd);
}
lineStart = line.BufferStart;
if (line.VisibilityState != VSTF.VisibilityState.FullyVisible)
{
wpfHexView.DisplayHexLineContainingBufferPosition(line.BufferStart, 0, VSTE.ViewRelativePosition.Bottom);
}
if (!line.IsValid)
{
line = wpfHexView.GetHexViewLineContainingBufferPosition(lineStart);
}
if (line.IsLastDocumentLine())
{
StopScrolling();
}
editorOperations.MoveCaret(line, xCoordinate, true, hexMoveToFlags);
break;
default:
throw new ArgumentOutOfRangeException(nameof(value));
}
wpfHexView.Caret.EnsureVisible();
}
